2019 Factory Off-Road Bikes—Thad Duvall’s Husqvarna FX 350

Details on Thad Duvall’s Husqvarna 350cc four-stroke Sprint Enduro steed.

Thad Duvall’s Husqvarna FX 350
Thad Duvall runs a WP Cone Valve fork and WP Trax shock, and all the work on them is done in-house by a WP technician.Shan Moore

While at the recent Rockcrusher Farm Full Gas Sprint Enduro, Rockstar Energy Husqvarna Factory Racing's Thad Duvall put in a strong performance by winning the last two tests of the weekend and finishing in the runner-up spot in the overall. Before the race, we took a look at Duvall's FX 350 with the help of his mechanic, Jose Cordova, who gave us the inside scoop on the midsize factory off-road bike.

Thad Duvall’s Husqvarna FX 350 rear brake rotor.
Galfer provides the front and rear brake rotors. Being that Duvall is hard on rear brakes, he uses a solid rear rotor to help dissipate heat. The rear brake caliper is a factory Brembo unit as well.Shan Moore

According to Cordova, the factory off-road team doesn’t use as much titanium as the Supercross and motocross team, but the off-road bikes are still plenty trick. Duvall runs a WP Cone Valve fork and WP Trax shock, and all the work on them is done in-house by a WP technician. As far as the suspension setup, Cordova told us that Duvall is pretty neutral.

“He rides a lot of moto too, so it kind of has to be set up for both,” Cordova said.

Duvall runs Excel A60 rims that are laced to stock hubs. He prefers a Dunlop MX3S tire up front and a Dunlop AT81 in the rear. He doesn’t like the feel of a new mousse, so Cordova installs a worn-in one. The front and rear rotors are provided by Galfer and are the standard sizes. The rear rotor is solid to dissipate heat and the rear brake caliper is a factory Brembo unit as well.

“Thad’s pretty hard on brakes, especially the rear,” Cordova said. “He likes the solid rotor in the rear whether it’s muddy or not. He can usually get an entire weekend out of a set of pads at the Sprint Enduro events.”

Thad Duvall’s Husqvarna FX 350 with Xtrig triple clamps.
The entire Rockstar Energy Husqvarna Factory Racing off-road team runs Xtrig triple clamps. They have the option to run a 22mm or 24mm offset, and all of the riders recently switched from 22mm to 24mm.Shan Moore

ProTaper provides the handlebar and grips; Duvall likes the soft-compound half-waffle grips. He runs an ARC front brake and clutch lever as well as Cycra hand guards. A Motion Pro throttle tube is used along with a billet throttle housing, which Cordova says is a bit stronger than the stock unit. The entire team runs Xtrig triple clamps with a 24mm offset.

“Our options on the Xtrig clamps are 22mm and 24mm,” Cordova explained. “We ran the 22mm for a little bit and the whole team just recently switched to the 24mm. Thad likes to steer with the rear end, so it kind of widens the bike a little bit.”

Duvall runs the stock radiators for Sprint Enduros, but he runs a little bit bigger ones on his GNCC bike. A fan is used on both bikes with a manual switch just to keep the bike cooler. Each of the team riders have their own spec FMF exhaust systems.

Thad Duvall’s Husqvarna FX 350 engine.
The ECU is set up in-house and, according to Cordova, Duvall’s engine is on the mellow side.Shan Moore

“FMF works personally with us and kind of develops something for the guys individually,” Cordova said. “These pipes are not available to the public.” As far as the drivetrain, an RK chain and Supersprox sprockets are used with 13:50 gearing, along with a TM Designworks chain guide. The clutch is a Rekluse Core Manual TorqDrive, and IMS makes a clear fuel tank for the team and supplies the footpegs as well. The ECU is set up in-house and, according to Cordova, Duvall’s engine is on the mellow side.

“He’s got to hold onto this thing for three hours, so he needs manageable power,” Cordova said. “At the start of the year, we test different settings, see what he likes, and then he kind of stays with the same thing the whole year.”

The seat is made by Guts Racing and Duvall prefers a seat bump that is a bit farther forward than most riders. As far as working with Duvall, Cordova says he’s mainly just hard on the rear brake.

“[The rear brake] is the only thing he’s really [hard] on,” Cordova said. “I’ve got to bleed it after every time he rides. Other than that, he’s pretty good on the bike. That’s really all it is, just the rear brake. He uses [the front brake], but not as much as the rear. Like I said, he likes to control the bike with the rear, so that’s kind of why he’s on the rear brake [a lot].